Flora of North America species comparison

20-70 cm, erect or decumbent;

internodes mostly scabridulous or smooth, always scabridulous below the nodes.

40-120 cm, erect, not conspicuously branched;

internodes mostly smooth, sometimes scabridulous below the nodes.

usually shorter than the internodes, glabrous, smooth or scabridulous, usually without necrotic spots, not becoming spirally coiled when old;

ligules 1.2-3(5) mm, membranous throughout, acute, often lacerate;

blades 2-13 cm long, 1.2-2.5 mm wide, flat or loosely involute, scabridulous or glabrous abaxially, scabrous adaxially, usually without necrotic spots.

longer than the internodes, smooth or scabridulous, rounded towards the base, not becoming spirally coiled when old;

ligules 2-8 mm, firm below, membranous distally, obtuse to acute;

blades 15-50 cm long, 0.3-1.5 mm wide, flat to involute, smooth or scabridulous abaxially, hirtellous adaxially.

numerous, terminal and axillary, 7-20 cm long, 0.3-1.4(3) cm wide, contracted, often lax, nodding, interrupted below;

primary branches 3.5-7.5 cm, ascending or diverging up to 70° from the rachises, spikelet-bearing to the base;

pedicels 1-3 mm, antrorsely scabrous;

disarticulation above the glumes.

15-50 cm long, 1-7 cm wide, loosely contracted, not dense;

primary branches 1-8 cm, appressed or diverging up to 30° from the rachises, naked basally;

pedicels 1.3-8 mm, hispidulous.

2-4 mm, often purplish, borne singly.

3-4.2 mm.

1.2-2.8 mm, shorter than the florets, 1-veined, veins scabrous, apices often erose, unawned or awned, awns to 0.5 mm;

lower glumes 1.2-2 mm, acute to acuminate;

upper glumes 1.5-2.8 mm, acute;

lemmas 2-3.5(4) mm, lanceolate, mostly smooth, scabridulous distally, pubescent on the calluses, lower 1/2 of the midveins, and margins, hairs 0.5-1.5 mm, apices acuminate to acute, awned, awns 10-30 mm, scabrous, sinuous to flexuous;

paleas 1.8-3.4(3.8) mm, lanceolate, sparsely villous basally, apices acuminate to acute;

anthers 0.9-1.5 mm, yellowish.

subequal, 2-3 mm, exceeded by the florets, glabrous below, minutely pubescent or scabridulous distally, 1-veined, acuminate to acute, unawned or awned, awns to 1.6 mm;

lemmas 2.8-4.2 mm, narrow, lanceolate, calluses hairy, hairs to 1 mm, lemma bodies glabrous and smooth below, scabridulous distally, apices acuminate, awned, awns 8-40 mm, straight to flexuous, demarcation of the awns from the lemma bodies not evident;

paleas 2.8-4.2 mm, narrowly lanceolate, glabrous, acuminate;

anthers 1.4-2.2 mm, yellow.

1-2.2 mm, narrowly fusiform, brownish.

2-2.2 mm, fusiform, brownish.

panicles not present.

= 20, 40.

= unknown.